fdo#74160 firebird XParameters::setString truncate to 65535 characters

as opposed to 17 characters

Change-Id: I65c82243946c22eee0f033977b1cd0c5a84d226b
TODO comment

Change-Id: I3df4810534d64bb7f546cc18124edb6ebf3a147d
firebird driver: do not assume sizeof(short) == 2

Change-Id: I4b4e6caa34c23baa75a87cf1750dce3ca3ae8aed